Clam-shell bucket.



WITNESS W; RAWLEY & W. M. VENABLE.

CLAM SHELL BUCKET.

APPLICATION FILED OCT- 3, 1917.

Fatentod Mar. 12, $918.

iNVENTGFi W. RAWLEY & W. M. \IENABLE. SLAM SHELL BUCKET. APPLICATION HLED on. 3, 1911.

Eatenmd Ma 12, 1918.

3 SHEETSSHEET 2.

W. RAWLEY & W. M. VENABLE.

CLAIM SHELL BUCKET.

APPLICATION FlLED OCT- 3.1917.

WITNESS Patented Mar. 12, 1918.

3 SHEETS-SHEET 3.

the?? esszsn'oas T BLAW-KNOX ooiurauy,

A CORPORATION GE NEW JERSEY.

ELEM-SHELL BUCKET.

Application filed October 3 To all 207mm it may concern:

Be it known that we, EVAYNE RAWLEY and WILLMM M. VENABLE, both citizens of the United States, and both residing at Pittsbur h, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Clam Shell Buckets, of which the following is a speciblocks, (4) wherein cheap-and effective means are provided for applying weight, for overhauling the pulley blocks and increasing the dead weight of the bucket to give the desired penetration thereof while digging, and wherein the counterweight employed is brought to rest when the bucket is open in such position as to facilitate the commencement of the digging operation. One embodiment of the invention is illustrated in the accompanying drawings, wherein-- 6 Figure 1 is a side elevation of the apparatus containing the invention with the jaws of the bucket in closed position; Fig. 2 is a side elevation similar to that of Fig. l butwith the jaws in open position; and Fig.

3 is an end elevation looking at the apparatus from the right-hand side of Fig. 1.

The jaws 1 and 2 may be of any approved type, such jaws being hinged or pivoted together upon the pin or axle 3. They are supported from the head bio-cl: 4 by means of two pairs of corner bare; 5 and 6, 6. Both pairs of corner bars are pivoted at their lower ends to the jaws, as indicated at 7 and 8, and the corner bars 6- are also pivoted "upon the pin 9 extending tram-s versely oi the head. The corner bars 5 riveted to the head block 4.- at their upper ends, as indicated at 10. The use of the riveted construction at this point gives a rigid head block construction and reduces the number of hearings necessary in the con- Specifieation of Letters Fatent.

Patented :22, E518.

Serial No. weave.

struction which would otherwise be required if the upper ends of these bars 5 were connccted to the head block in the same manner as the bars" 6.

The head block 4 consists of two sheet metal plates held in position by the bolts 11 with pipe spreadcrs 12 (Fig. 3) interposed between the plates. The upper portion of the block carries the lead device or guide for the closing line -l3, such device consisting of the usual grooved member ll and roller 15 fitting into the groove. The head also carries the transverse pins or axles 9 and 18 upon each of which are mounted two sheaves or pulleys. the pin 16 carrying the sheaves 17 and 18 (18 being behind 17 and not, shown), and the pin 9 carrying the sheaves 19 and 20.

Mounted upon the pin or axle 3 is a coun terweight box 21, such box being free to oscillate upon the pin. The upper portion of the box has secured rigidly thereto a pair of plates and 23 constituting a sheave block and carrying the pins or axles 2i and 25. The pin 24 carries two sheaves 26 and 27 (27 being behind 26 and not shown), while the pin carries two other sheaves 28 and 29.

The counterweight boxfil is designed to overhaul the closing line when the bucuet moves to the position shown in Fig. 2, also gives additionaldead weight to the bucket to increase its penetration while dig'eing. This box may be filled with any desired material for giving the required weight, the preferred material being punch.

ings from steel plates, although dirt, sand or other material may be employed. 'lihie box is preferably provided with a cover or opening, notsho'wn, to enable the material to be removed and replaced when desired. This arrangement not only provides for ad justing the weight. to suit conditions, but permits the additional Weight to be given to the bucket without any substantial in-- crease in the cost of the apparatus.

The box is pivoted so that it oscillate during the closing of the bucket so as to properly equalize the strain in the various sections of the hne. in order the box may assume a horizontal posltion, as shown in Fig. 2, and so not interfere with the ma erial to be dug, when the box is in lowest position, the angles 36 and 31 are employed, secured respectively to the box be apparent thetthe inventions may-Toe em 31151. to the bucket jaws (Fig. 2 These stop members also in ure that the sheaves carried. by the bin: shat be in proper posiing upon conditions, When the bucket is reeved. so as to secure the most powerful closing efieet the tine posses around all of the sheeves. At this time the path of the cable is as follows. Sheaves 26, 17, 27, 18, 20,29, 19, 28, the cable being secured at its end to the bolt This arrangement gives eight parts to the closing tine, or in other Words, gives the bucket eight times as much closing power ss'if the line instead of coming around the sheaves were made, test ciirectiy to the counterweight box.

)1? it Is tiesii'ed to reeve the bucket 50 as 25?,to I

It W151 be seen that the sheave arrange ment permits of e niuitlpnclty of sheaves White avoiding wi ie blocks, and 21st substentieiiy central iestis are provided the ciosing tines so that the power is e opliect stivsotageousiy with reietive'iy smaii amount of? sitie pelt, Also that the construction compact and may be eioespiy constructed with e minis'mm amount of fosging emf. mciiine Work. .Gtixer sdven teges incidene so construction and not ieretofoie pointei Wiii be apparent to those ski'iiled. in the act, to Whom it "will also bodied in a number of ciifi'erent forms and modifications, the one shown being merely Tied onthe receptacle and a closing line extenciing around the sheaves on the head block and counterweight,

2. in combination, e pair 'ofibuckct jaws pivoted together, ahead block, corner bars extending from the bucket to said head block, a box pivotally mounted. at the pivotal connection between vthe bucket jaws, sheaves supported between the sides of the.

box, sheaves 'on the head block, counter- "opening'the jaws, and stop meanscooperat mg between the said receptacle and the MIWS for positioning the receptacle when the jaws are opened.

4'. In combination, e pair of bucket jaws pivoted together, a heacifblock, corner oars extending from the bucltetjews to said heed block, is second block pivotaily mounted at thepivotal connection between the bucket jaws, stieave on the head Mock on each side of the vertlcal center line thereof, s

, sheave on the second block on each side of the vertical center line thereof, stop means for positioning the second block when the jaws ai'e opened, and e closing line extend-'- ing around the'sheavesof the two stocks,

in combination, a pair of bucket jaws pivoted together, a head block, corner Tom's extending from the bucket jaws to said head biock, a second block pivotally mounted at the pivotal connection between the bucket jaws, a sheave on the head block on each side of the vertical center line thereof, a

sheave on the second clock on each side of the vertical} center line thereof, stop means for positioning the second block when the jaws are opened, and a closing time extenderonnd the sheaves of the two blocks.

In combination, :1 pair of jews pivoted I together, a head, corner bars connecting the gaws and head. means for ctosmg'the jaws,

a receptacle adapted to receive a weight of material and act as a counterweight for opening the jaws, and stop means for posi 'cioning the receptacle when the jaws are opened.

WAYNE RAWLEY. WILLIAM M, VENABL 

